21131213023 has 8 divisors (see below), whose sum is σ = 21829345280. Its totient is φ = 20434110840.

The previous prime is 21131213021. The next prime is 21131213041. The reversal of 21131213023 is 32031213112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21131213023 - 2¹ = 21131213021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131213021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215703 + ... + 297976.

It is an arithmetic number, because the mean of its divisors is an integer number (2728668160).

Almost surely, 2^21131213023 is an apocalyptic number.

21131213023 is a deficient number, since it is larger than the sum of its proper divisors (698132257).

21131213023 is a wasteful number, since it uses less digits than its factorization.

21131213023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515037.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21131213023 its reverse (32031213112), we get a palindrome (53162426135).

The spelling of 21131213023 in words is "twenty-one billion, one hundred thirty-one million, two hundred thirteen thousand, twenty-three".